Download e-book for iPad: Industrial Motor Control by Stephen Herman

By Stephen Herman

ISBN-10: 1435442393

ISBN-13: 9781435442399

The recent and up-to-date sixth version of commercial Motor keep an eye on is the main finished revision of the e-book because it was once released over two decades in the past. With the most important, updated details on simple relay keep an eye on platforms, programmable common sense controllers, and sturdy kingdom units typically present in an commercial atmosphere, this booklet is a must-have. It provides easy-to-follow directions and the fundamental details for controlling business automobiles, in addition to established units in modern business settings. insurance is thorough in scope, effectively bridging the space among commercial upkeep and instrumentation. Readers will achieve a primary knowing of the operation of variable frequency drives, stable nation relays, and different functions that hire digital units.

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Example text

Shaft until the line on the shaft representing the desired current is flush with the top of the dashpot container (Figure 4–27). A dashpot overload relay is shown in Figure 4–28. Overload Contacts Although all overload relays contain a set of normally closed contacts, some manufacturers also add a set of normally open contacts as well. These two sets of contacts are either in the form of a single-pole double-throw switch or of two separate contacts. The single-pole double-throw switch arrangement will contain a common terminal (C), a normally closed terminal (NC), and a normally open terminal (NO) (Figure 4 – 29).

If you were installing the circuit in Figure 2 – 20, what type of push button would you use for the silence button? a. Normally closed. b. Normally open. 7. Referring to the circuit in Figure 2 – 20, should the float switch be connected as a normally open or normally closed switch? 8. Referring to the circuit in Figure 2 – 20, what circuit component controls the actions of the two CR contacts? 9. Why is a circle most often used to represent a coil in a motor control schematic? 10. When reading a schematic diagram, are the control components shown as they should be when the machine is turned off or de-energized, or are they shown as they should be when the machine is in operation?

Position permits the float switch to control the pump. ) operate on 240 volts, or direct current motors. The starters that contain three contacts are intended to control three-phase motors. Push-button type manual starters are integral, not fractional, horsepower starters. Generally, they can control single-phase motors rated up to 5 horsepower, direct current motors up to 2 horsepower, and three-phase motors up to 10 horsepower. A typical three-contact manual push-button starter is shown in Figure 3–11.

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Industrial Motor Control by Stephen Herman

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